812cd08b1c3b3952b0168b85b8e7e2a773b6bbc6,ggplot/geoms/facet_grid.py,facet_grid,__radd__,#facet_grid#Any#,17

Before Change

            x = gg.data.get(self.x)
        except:
            raise Exception("facet_grid(): mapping for x (\"%s\") is not available in the DataFrame" % self.x)
        try:
            y = gg.data.get(self.y)
        except:
            raise Exception("facet_grid(): mapping for y (\"%s\") is not available in the DataFrame" % self.y)
        if x is None:
            n_dim_x = 1
        else:
            n_dim_x = x.nunique()

After Change

        x = gg.data.get(self.x)
        y = gg.data.get(self.y)

        if x is None and y is None:
            raise Exception("No facets provided!")

        if x is None:
            n_dim_x = 1
        else:
            n_dim_x = x.nunique()

Instances